Simone and Sipowicz investigate a shooting that is related to the victim trying to leave a street gang. Meanwhile, Kirkendall and Russell investigate the death of a baby who appears to have been shaken to death by the baby-sitter. Medavoy and Martinez look into a murder at a garage where they have a suspect who looks guilty despite the fact he claims to have an alibi. That evening, Medavoy has dinner with Abby and her lover, Kathy. Also, Simone takes Russell out to a movie and proposes to her again, and this time she accepts.

Five Ecuadorians are found murdered at a small nightclub in an apparent robbery gone bad. Sipowicz, Simone, and Martinez work on the case where a tip from a waiter at the club leads them to try to find the two killers responsible. Meanwhile, Simone begins his undercover work for the FBI when he secretly meets with Joey Salvo who wants Simone to run a license plate number for him. Also, Russell and Medavoy are looking into a suspect in a spouse abuse case where Medavoy's commitment to Abby and Kathy hampers the investigation due to Medavoy's emotional attitude. Also, Medavoy discovers that Detective Gotelli is stealing money out of his locker in the light of his medical condition.